Bacteria (/ b æ k ˈ t ɪər i ə / ⓘ; sg.: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms .

2015年1月9日 · The meaning of BACTERIUM is any of a domain (Bacteria) of chiefly round, spiral, or rod-shaped single-celled prokaryotic microorganisms that typically live in soil, water, …

5 天之前 · bacteria, any of a group of microscopic single-celled organisms that live in enormous numbers in almost every environment on Earth, from deep-sea vents to deep below Earth’s …

2019年10月4日 · Bacteria are single-celled microorganisms with prokaryotic cells, which are single cells that do not have organelles or a true nucleus and are less complex than eukaryotic …

2 天之前 · Bacteria are microorganisms that come in various shapes. They can be spheres, they can be rods, or they can be spirals. There are bacteria that are bad, that we call pathogenic, …

Bacteria are microscopic living organisms that have only one cell. The word for just one is “bacterium.” Millions (if not billions) of different types of bacteria can be found all over the …

2024年10月13日 · Bacteria are single-celled prokaryote organisms, which means they comprise one single biological cell with no nucleus. They exist in pairs, chains, or clusters. They are …